On 11/12/2024 11:17 AM, Anthony Willard via CQ-Contest wrote:
Just throwing this out there, have you considered using server power supplies?
As Drew has noted, FCC requirements for NOISE is most stringent for
Residential stuff, like about 20 dB.
The quietest power supplies are LINEAR. The Astrons I recommend are
LINEAR. There are issues even with those, but they are easy to fix. In
addition to audio distortion, the defect can cause instability
(oscillation).
http://k9yc.com/PowerSupplyBondingAndAudioDistortion.pdf
How much noise we hear from ANY source will depend proximity to the
antennas connected to our receiver, where they are pointed, the
frequency content of the noise, and how effective the wires connected to
that source are as antennas. We can reduce their effectiveness by
winding turns through Fair-Rite #31 ferrite cores.
See http://k9yc.com/KillingReceiveNoise.pdf
73, Jim K9YC
73, Jim K9YC
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